<demo>加载中</demo>
<template>
  <lc-button loading type="success">加载中</lc-button>
  <lc-button loading>加载中</lc-button>
  <lc-button loading type="success" iconPositon="right">在右边</lc-button>
  <lc-button loading iconPositon="right">在右边</lc-button>
</template>
